Foundry coatings are one of the most critical auxiliary materials in the casting process. By applying the coating to the surface of sand cores or molds—via dipping, brushing, or spraying—a protective barrier is formed between the molten metal and the mold/core. This barrier significantly improves casting surface quality, prevents common defects, and enhances cleaning efficiency, effectively guarding against sand adhesion, scabbing, sand inclusions, and porosity.
1、Advantage of ASK foundry coatings
ASK Chemistry, innovation-driven and utilizing unique refractory formulations and digital production equipment, possesses global technological capabilities. It is committed to providing customers with full value-chain support, from conceptual design and process simulation to prototype production.
ASK Coatings (alcohol-based and water-based) effectively improve the surface quality of castings, prevent unwanted chemical or thermal reactions, reduce cleaning time, and suppress various casting defects (such as sand adhesion, sintering, veining, porosity, and inclusions). Their excellent suspension properties, application performance, and high-temperature resistance significantly enhance foundry productivity, casting quality, and cost efficiency, making them suitable for various casting processes and application methods.
Our company is an authorized distributor of ASK (Zhenjiang) New Materials Technology Co., Ltd., representing their full range of products, including ASK coatings, resins, exothermic feeding risers, and more.
1.1Alcohol-based mold coating
Model | Processes | Application Method | Application | Characteristics |
ASK VELVALITE NM35C | Green sand mold, Resin sand mold, Iron mold with sand lining | Spraying | Cast iron and aluminum | VELVALITE NM35C mold coating is an excellent mold coating with outstanding anti-sand adhesion and anti-sintering properties, mostly used for spraying. It has good room-temperature and high-temperature performance, is not easy to crack after spraying, leaves little coating residue on the casting surface, does not easily fall off under the action of high-temperature molten iron, and has obvious advantages in inhibiting coating inclusion defects in castings. |
1.2 Sand Core Coating
（1）VELVACOAT Series Alcohol-Based Coatings
Model | Process | Application Method | Application | Features |
ASK VELVACOAT AC 501 | Epoxy, cold-box, silicate | Dip / Flow coat | Aluminum castings (e.g.housing components) | Excellent anti-veining, strong anti-burn-on, fire-retardant |
ASK VELVACOAT CC 601 | Epoxy, cold-box, hot-box, silicate | Dip / Flow / Spray / Brush | Small-to-medium iron castings; universal cores (e.g. slot cores) | Strong anti-burn-on, easy strip |
ASK VELVACOAT GH 501 | Epoxy, cold-box, hot-box, silicate, no-bake | Dip / Flow / Spray | Small-to-medium iron castings; pump housings, counterweights, gearbox cases | Powerful anti-veining, strong anti-burn-on |
ASK VELVACOAT GH 701 | Epoxy, silicate, no-bake | Dip / Flow | Small-to-medium iron motor housings | Strong anti-burn-on, very high permeability |
ASK VELVACOAT HI 502 | Epoxy, cold-box, hot-box, silicate, no-bake | Dip / Flow / Spray | Small-to-medium iron castings; universal (gearboxes, pumps, valves) | Good anti-veining, strong anti-burn-on |
ASK VELVACOAT HI 602 | Silicate, no-bake | Flow / Spray / Brush | Small-to-large iron castings; universal (counterweights, wind hubs, large gearbox housings) | Strong anti-veining, strong anti-burn-on |
ASK VELVACOAT HI 707 | Epoxy, cold-box, hot-box, silicate, no-bake | Dip / Flow / Spray / Brush | Small-to-medium iron castings; universal (gearboxes, pumps, valves) | Good anti-veining, strong anti-burn-on, excellent suspension |
ASK VELVACOAT ST 606 | Epoxy, cold-box, hot-box, silicate, no-bake | Dip / Flow / Spray / Brush | Large iron & steel castings (pumps, housings) | Strong anti-burn-on, good flowability |
ASK VELVACOAT ST 702 | Epoxy, cold-box, hot-box, silicate, no-bake | Dip / Flow / Spray / Brush | Large iron & steel castings (pumps, housings) | Strong anti-burn-on, good flowability |
ASK VELVACOAT ST 707 | Epoxy, cold-box, hot-box, silicate, no-bake | Flow / Spray / Brush | Large iron & steel castings (e.g. water-steam turbines) | Strong anti-burn-on, high refractoriness |
ASK VELVACOAT ST 801 | Epoxy, silicate, no-bake | Dip / Flow / Spray / Brush | Large iron & steel castings (e.g. switch points) | Strong anti-burn-on |
ASK VELVACOAT HI 733 | Epoxy, cold-box, hot-box, silicate, no-bake | Dip / Flow / Spray / Brush | Very large castings (wind hubs, steam turbines) | Strong anti-burn-on, ultra-high refractoriness |
ASK VELVACOAT IM 701 | Epoxy, cold-box, hot-box, silicate, no-bake | Flow / Spray / Brush | Universal for large iron & steel castings (medium gearboxes, pump housings) | Strong anti-burn-on, dip-coat friendly |
ASK VELVACOAT IM 801 | Epoxy, cold-box, hot-box, silicate, no-bake | Dip / Flow / Spray / Brush | Universal for large iron & steel castings | Strong anti-burn-on, dip-coat friendly |
ASK VELVACOAT IM 801 (DOSE) | Epoxy, cold-box, hot-box, silicate, no-bake | Dip / Flow / Spray / Brush | Large iron & steel castings; ready-to-use aerosol can | Strong anti-burn-on, dip-coat friendly |
（2）MIRATEC Series Water-Based Coatings
Model | Processes | Application Method | Application | Characteristics |
ASK MIRATEC AC 503 | Cold box, Hot box | Dipping, Spraying | Cast aluminum (such as engine blocks) | Strong peelability |
ASK MIRATEC BD 509 | Cold box | Dipping | Small and medium cast iron; Automotive castings (such as brake discs) | Strong anti-veining effect, good anti-sand adhesion effect, high air permeability, strong coverage, short reaction time |
ASK MIRATEC DH 401 | Cold box, Hot box | Dipping | Small and medium cast iron; Automotive castings (such as various housings) | Good anti-veining effect, good anti-sand adhesion effect, short reaction time |
ASK MIRATEC HC 501 | Cold box, Hot box | Dipping | Small and medium cast iron; Automotive castings (such as engine blocks and hydraulic castings) | Good anti-veining effect, strong anti-sand adhesion effect |
ASK MIRATEC MB 501 | Cold box, Hot box | Dipping | Small and medium cast iron; Automotive castings (such as cylinder heads and engine blocks) | Strong anti-veining effect, good anti-sand adhesion effect, good coverage |
ASK MIRATEC DH 402 | Cold box, Hot box | Dipping, Spraying | Small and medium cast iron; General coating (such as housing components) | Good anti-veining effect, good anti-sand adhesion effect, high air permeability, good coverage, high refractoriness |
ASK MIRATEC GH 401 | Cold box, Hot box | Dipping | Small and medium cast iron; General coating (gearbox housings) | Good anti-veining effect, good anti-sand adhesion effect |
ASK MIRATEC HY-SERIES | Epoxy resin, Cold box, Hot box, Silicate, Self-hardening | Dipping | Large, small and medium cast iron; Automotive castings (such as cylinder heads, engine blocks) | Strong anti-veining effect, strong anti-sand adhesion effect, good air permeability, good coverage, soluble in alcohol-based |
ASK MIRATEC TS-SERIES | Cold box, Hot box | Dipping | Small and medium cast iron; Automotive castings (such as cylinder heads, engine blocks) | Strong anti-veining effect, strong anti-sand adhesion effect, high air permeability, strong coverage, reduces residual dust on castings |
（3）SOLITEC Series Water-Based Coatings
Model | Process | Application Method | Application | Features |
ASK SOLITEC HI 703 | Epoxy, Silicate, No-bake | Flow / Spray / Brush | Large & small-to-medium iron and copper castings; heavy castings (e.g. wind-rotor hubs, hydro/steam turbines) | Strong anti-burn-on, high refractoriness, prevents graphite degeneration |
ASK SOLITEC IM 702 | Epoxy, Cold-box, Silicate, No-bake | Dip / Flow / Spray / Brush | Steel or large iron castings (e.g. machine-tool beds, frames, super-diesel engine blocks) | Strong anti-burn-on, excellent penetration |
ASK SOLITEC ST 701 | Cold-box, Hot-box, Silicate, No-bake | Flow / Spray / Brush | Steel or large iron castings; heavy castings (e.g. wind-rotor hubs) | Strong anti-burn-on |
ASK SOLITEC ST 801 | No-bake | Dip / Flow / Spray / Brush | Steel or large iron castings (e.g. pump housings) | Strong anti-burn-on |
ASK SOLITEC WP 401 | Cold-box, Hot-box, Silicate, No-bake | Flow / Spray / Brush | Large & small-to-medium iron castings (e.g. wind-rotor hubs, hydro/steam turbines) | Strong anti-veining, strong anti-burn-on, prevents graphite degeneration |
ASK SOLITEC AD-Series | Gravity die casting | Spray / Brush | Gravity die casting | Extended die life, excellent surface finish |
ASK SOLITEC CC-Series | Silicate | Spray / Brush | Centrifugal castings | Strong anti-burn-on, good permeability, good coverage |
ASK SOLITEC MS-Series | Permanent mold / metal die process | Dip / Flow / Spray / Brush | Permanent molds or tooling | High thermal-shock resistance |
（4）CERAMCOTE Series Water-Based Coatings
Model | Process | Application Method | Application | Features |
ASK CERAMCOTE FS 402 | Lost-foam & full-mold casting (EPC) | Dip / Flow / Spray / Brush | Large & small-to-medium iron castings | Effective anti-veining, strong anti-burn-on, high permeability, excellent coverage |
ASK CERAMCOTE FS 503 | Lost-foam & full-mold casting (EPC) | Dip / Flow / Spray / Brush | Steel, manganese steel, large & small-to-medium iron castings | Effective anti-veining, strong anti-burn-on, high permeability, excellent coverage |
Precautions
1. Whether using water-based or alcohol-based coatings, thorough pre-stirring is essential before application to ensure uniform mixing, improving the coating's penetration, leveling, and coverage.
2. When ambient temperature is low, it is recommended to add heating rods or heat tracing tapes in (or around) the dip tank to maintain the coating temperature between 10–20°C.
3. For dip coating processes, strictly control the immersion time and drainage procedure of sand cores to achieve optimal wet film thickness and penetration depth.
4. After applying water-based coatings, ensure adequate drying of sand cores. The recommended moisture content after drying should be ≤0.3%.
Foundry coatings are one of the most critical auxiliary materials in the casting process. By applying the coating to the surface of sand cores or molds—via dipping, brushing, or spraying—a protective barrier is formed between the molten metal and the mold/core. This barrier significantly improves casting surface qualit...
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